Being Ninjanessless, which in essence means not having very much Ninjaness which is natural Ninja ability. Many Self-proclaimed Ninjas usually have a lot of Ninjanesslessness, even though they think they have a lot of Ninjaness. This is easily remedied by attempting a backflip.

That guy is so full of Ninjanesslessness, he couldn't be less ninja if he tried to catch an arrow and sprained his wrist!